Color fatness to washing means, A specimen of the textile, in contact with one or two specified adjacent fabrics, is mechanically agitated under described conditions of time and temperature in a soap solution, then rinsed and dried. The change in color of the specimen and the staining of the adjacent fabric are assessed with the grey scales.

In my personal experience, in case of fastness test color fastness to washing is the first and most important requirements of buyers. There are a number of ISO test for color fastness to washing.

Collecting the sample from bulk and then conditioning for 04.30 to 06 hours ↓ Making a specimen of 04 cm*10 cm in size. ↓ Sewing the specimen with multi-fibre fabric of same size at one corner. ↓ Making the solution of 4gm/litre ECE detergent & 1 gm/litre sodium perborate, (If required SKFL use 0.15 gm/litre TAED). ↓ Putting the specimen with multi-fibre fabric into the solution in Rotawash m/c Prog.: C2S Temp.: 60OC/ 40OC Time: 30 min Still ball: 25 pcs ↓ Rinsing with hot water respectively. ↓ Squeezing with cold water of the sample is done (Hand Wash). ↓ Then drying is done at a temperature in the air not exceeding 60OC ↓ The stitching is then broken out except on one of the shorter end. ↓ Measuring the staining and color change by grey scale & make a test report.

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